Figure 1. DKK2 expression differences in oral squamous cell carcinoma. (A) DKK2 protein expression in human oral squamous cell carcinoma tissues (T) and normal oral mucosa tissues (N). (B) DKK2 protein expression in HOK, CAL27, and SCC15. (C) DKK2 expression in hypoxic and normoxic in SCC15 cell. (D) DKK2 expression in hypoxic and normoxic in CAL27 cell. *p < 0.05; **p < 0.01; ***p < 0.001; ****p < 0.0001.